As you know Xiaomi MIUI OS is based on Android system, its base code has many aspects to be optimized, so MIUI OS upgrading speed will be a little slower. Today Xiaomi MIUI 8 based on Android7.0 Developer Version public test officially announces.
In this time update, it includes Xiaomi MI5S, Xiaomi MI5S Plus, Xiaomi MI Note 2, Xiaomi MI MIX four Xiaomi flagship.
The update changelog as follow:
Update to Android N OS
Lock screen, state bar and notification bar
Fix not showing illustration zone in notification bar
Fix the issue to enter the right password and remind wrong.
Optimize sliding responding time
Optimize loading speed, reduce largely the loading time
Fix the issue to show the flash problem after recovering backup.
Fix the issue that under some circumstance, the icon doesn’t show.
As for the detailed update changelog, just check more from Xiaomi official website.